Meanwhile, for sauce, in a food processorbowl combine nuts, cheese, and garlic. Cover and process until chopped. Add about half the basil and all of the oil; process until basil is chopped, stopping the machine occasionally to scrape the sides. Add remaining basil and repeat. Add tomatoes; process with several on/off turns; the tomatoes should remain chunky. (If the mixture is too smooth, add some fresh chopped tomato.) Season to taste with salt and pepper.